Blunted Sleep-related Luteinizing Hormone Rise in Healthy Premenarcheal Pubertal Girls with Elevated Body Mass Index

Overview

Journal J Clin Endocrinol Metab

Publisher Oxford University Press

Specialty Endocrinology

Date 2009 Feb 5

PMID 19190110

Citations 26

Authors

Brian Bordini

Elizabeth Littlejohn

Robert L Rosenfield

Affiliations

Soon will be listed here.

Abstract

Objective: Our objective was to determine whether excessive adiposity is associated with alteration of the normal hormonal changes of early pubertal girls.

Design And Participants: Healthy 6.4- to 9.5-yr-old, prepubertal (PRE, n = 20) and 9.4- to 13.0-yr-old pubertal premenarcheal volunteers (PUB, n = 20) were divided into excessive-weight (EW) or normal-weight (NW) groups according to the 85th percentile body mass index. INTERVENTIONS AND SETTING: Overnight blood sampling; GnRH agonist (GnRHag), low-dose ACTH, oral glucose tolerance tests, and pelvic ultrasonograms were performed in our Clinical Research Center.

Results: EW girls were similar in age and baseline and ACTH- and GnRHag-stimulated androgen levels to stage-matched NW girls. However, the sleep-related LH rise was blunted in EW-PUB girls compared with NW-PUB girls. The sleep-related rise of mean LH in EW-PUB [0.68 +/- 0.35 (sem) U/liter] was insignificant, less than that of NW-PUB (2.1 +/- 0.45, P < 0.05) and not significantly different from that of PRE girls (0.08+/-0.03). EW-PUB had slower LH pulse frequency and a lower rise in LH pulse amplitude during sleep than NW-PUB girls (both P < 0.05). Overnight FSH patterns paralleled LH patterns, whereas estradiol levels were similar in stage-matched NW and EW groups, differing between stages as expected. Early morning and peak LH, FSH, and estradiol responses to GnRHag were similar in EW-PUB and NW-PUB and significantly greater than those of PRE girls.

Conclusions: Healthy EW-PUB girls have significantly blunted sleep-related LH production. These data suggest that excess adiposity, in the absence of sex steroid excess, may subtly suppress hypothalamic-pituitary-gonadal function in premenarcheal pubertal girls.

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